Tree Location Data Base..

I've just finished a book about significant trees in Australia, however the name escapes me. But it covers most of those trees you mention. There are already significant tree registers in most states and many are managed by national trust and are under heritage protection.

When i get home i'll grab the name of the book.

I can add a POI type in places if you wish and you can register the tree's in there along with descriptions and photos. Are you interested in starting to populate this? Are there any others who would be keen to manage/moderate this POI type.